Three.JS 从世界坐标系转换到屏幕坐标系

1 var projector = new THREE.Projector();
2
3 var world_vector = new THREE.Vector3(0,0,1);
4
5 var vector = projector.projectVector(world_vector, camera);
6
7 var halfWidth = window.innerWidth / 2;
8 var halfHeight = window.innerHeight / 2;
9
10 var result = {
11
12     x: Math.round(vector.x * halfWidth + halfWidth),
13     y: Math.round(-vector.y * halfHeight + halfHeight)
14
15 };